Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c3a976c782c96f…

MALICIOUS

PDF

98.4 KB Created: 2021-09-04 20:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 516523014a3fb4bf4f657b23adea9f79 SHA-1: e60b09010161c0beb303da412165c2a55ca588a5 SHA-256: 33c3a976c782c96f6b72071f1d5b7942315edae7323f37e05fee2c9149e9af52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm hosted on multiple disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest the document's purpose is to redirect users to potentially compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8465adl24lj3lsldtuiqp9pf64/63533636150.pdf In PDF document text
    • http://griby.biz/ckfinder/userfiles/files/gokarerikuririmonemaku.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6b6d7c52f---lizurisekom.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/pumozemubuxixasorifa.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/58684853370.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/71726f00e95863a494070b404bdd4387/basuwigokiwonozip.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/041456349686.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160beeb2b700e4---84658083254.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/sonepifuv.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/kunadijijotipelilosijafun.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/dowedumenudivanajugebifig.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/fenolum.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/57614140729.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/finalajilasanur.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/50a67d543ac57902f25e7b432dd4d2bb/ferawapafotonej.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/45493150087.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/34771125309.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/21605691014.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/18196749566.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d60426e3b39---zanog.pdfIn PDF document text
    • https://rosycaffe.com/file/zumejuperewabagasikiv.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/52373013540.pdfIn PDF document text
    • http://secoinblock.com/upload/files/66868614137.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202108161923553682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=network+analysis+diagram+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 18640 bytes
SHA-256: ca00cf68e8a86fda20d236fc7f3eed73628b1f02472215f491e395c940dab52c
font_01_sfnt_off000149dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149DD 11112 bytes
SHA-256: 4ba27076fc5a9b748e7fa3139888a5e4d136152a6cb4e3fc945a7d7127a6a9b9
font_02_sfnt_off000163a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1